3D touchless multiorder reflection structural color sensing display

Han Sol Kang, Sang Won Han, Chanho Park, Seung Won Lee, Hongkyu Eoh, Jonghyeok Baek, Dong Gap Shin, Tae Hyun Park, June Huh, Hyungsuk Lee, Dae Eun Kim, Du Yeol Ryu, Edwin L. Thomas, Won Gun Koh, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)


The development of a lightweight, low-power, user-interactive three-dimensional (3D) touchless display in which a human stimulus can be detected and simultaneously visualized in noncontact mode is of great interest. Here, we present a user-interactive 3D touchless sensing display based on multiorder reflection structural colors (SCs) of a thin, solid-state block copolymer (BCP) photonic crystal (PC). Full-visible-range SCs are developed in a BCP PC consisting of alternating lamellae, one of which contains a chemically cross-linked, interpenetrated hydrogel network. The absorption of a nonvolatile ionic liquid into the domains of the interpenetrated network allows for further manipulation of SC by using multiple-order photonic reflections, giving rise to unprecedented visible SCs arising from reflective color mixing. Furthermore, by using a hygroscopic ionic liquid ink, a printable 3D touchless interactive display is created where 3D position of a human finger is efficiently visualized in different SCs as a function of finger-to-display distance.

Original languageEnglish
Article numberabb5769
JournalScience Advances
Issue number30
Publication statusPublished - 2020 Jul

Bibliographical note

Publisher Copyright:
© 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

ASJC Scopus subject areas

  • General


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